DE212020000833U1 - Muscle preservation type total temporomandibular arthroplasty - Google Patents

Abstract

A muscle preservation type total temporomandibular arthroplasty, the prosthesis comprising, from top to bottom, at least: an acetabulum member (1) and a condyle member (2) abutting the acetabulum member (1); said acetabulum member (1) comprising a zygomatic arch support portion (12) for attachment to a zygomatic arch of a human body and an acetabular cup portion (11) connected to said zygomatic arch support portion (12); the condyle member (2) comprises a mandibular trailing edge attachment plate (21), a sigmoid notch attachment plate (22) and a condyle portion (23), the condyle portion (23) having a full or partial condyle shape and abutting the acetabulum member (1). ; the mandibular rear edge attachment plate (21) is connected to a lower end of the condyle portion (23) and extends downward and has a plate-like structure and includes a mandibular rear edge surface attachment surface closely fitted to a surface of a rear edge of a lower jaw of the human body; and the sigmoid notch mounting plate (22) protrudes from a side of the lower jaw trailing edge mounting plate (21) and extends in a direction away from the lower jaw trailing edge mounting plate (21) and has a plate-like structure and includes a lower jaw ramus proximal sigmoid notch portion attachment surface narrow is fitted to a proximal sigmoid notch portion of a mandibular ramus of the human body.

Description

TECHNICAL AREA

The present disclosure relates to the field of medical devices, particularly to a muscle preservation type temporomandibular total arthroplasty.

BACKGROUND

A temporomandibular joint is the only joint of a maxillofacial region that is connected to a left and right region, has rotational and gliding movements, and is one of the most anatomically and kinetically complex joints in the human body. Temporomandibular joint disease is a common and common disease and includes pain in the joint area, restriction of mouth opening, occlusion disorder, difficulty in mandibular movement and function and the like, which seriously affects the functions of chewing, speech and the like of patients and even endangering the lives of patients. In conditions such as late temporomandibular osteoarthropathy, severe idiopathic condylar resorption, ankylosing spondylitis, comminuted fracture, partial joint tumors and the like, lesioned joints must be removed and a complete temporomandibular joint (aka temporomandibular joint, TMJ) reconstructed using autologous or allogeneic tissue to remove the Restore form and function of the joint as much as possible. Total temporomandibular arthroplasty is an effective method of restoring joint form and function. Currently, Zimmer Biomet's standard products and TMJ Concepts' custom products are the major international products. However, these two prostheses are less widely used domestically due to poor adaptation to the joint structure of Chinese people and high price (RMB 70-150 thousand per side) respectively. A product with patent grant publication no. CN 205626192 U has good safety and efficacy demonstrated by a preliminary clinical trial. The three prostheses are mainly aimed at restoring a joint function, a condyle is completely removed in one operation and an insertion of a lateral pterygoid muscle at a joint is lost. Meanwhile, a mandibular grip is attached to a mandibular ramus surface and a partial attachment of a masseter is lost, so that a postoperative patient experiences complications of lateral movement restriction, severe mandibular deviation during mouth opening, and chewing weakness.

SUMMARY

The present disclosure provides a muscle preservation type temporomandibular total arthroplasty.

The prosthesis includes, from top to bottom, at least: an acetabulum member; and a condyle member abutting the acetabulum member. The acetabulum member includes a zygomatic arch support portion for attachment to a zygomatic arch of a human body and an acetabular cup portion connected to the zygomatic arch support portion. The condyle element includes a mandibular trailing edge mounting plate, a sigmoid notch mounting plate, and a condyle section. The condyle portion has a full or partial condyle shape and abuts the acetabulum member. The mandibular rear edge attachment plate is connected to a lower end of the condyle portion and extends downward and has a plate-like structure and includes a mandibular rear edge surface attachment surface closely fitted to a surface of a rear edge of a mandible of the human body. The sigmoid notch attachment plate protrudes from one side of the mandibular rear edge attachment plate and extends in a direction away from the mandibular rear edge attachment plate and has a plate-shaped structure and includes a mandibular ramus proximal sigmoid notch portion attachment surface that closely fits a proximal sigmoid notch portion of a mandibular ramus of the human body is adapted.

As described above, the muscle function preservation type temporomandibular total endoprosthesis of the present disclosure has the following beneficial effects:

The muscle function preservation type total temporomandibular joint prosthesis of the present disclosure can effectively restore a normal anatomical structure of the temporomandibular joint, can restore functions of chewing, speaking, moving, etc. of a patient, restores only a joint surface and preserves most of a joint bone structure and attachment and a function of a lateral pterygoid muscle and solves a problem of mandibular deviation of the patient. The prosthesis preserves most of the masseter insertion area and its functions and solves a problem of the patient's chewing weakness. The prosthesis favors the stress conduction and distribution of a mandible, can effectively avoid stress concentration of the prosthesis, and achieve long-term effective fixation. The prosthesis can connect quickly and firmly to a bone to maintain long-term stability of the prosthesis. The prosthesis features fine construction, reduces surgical wounds, shortens surgical time and reduces surgical difficulties. The present disclosure individually restores temporomandibular joint, preserves attachment of lateral pterygoid muscle and masseter, and has remarkable effects on normal restoration of temporomandibular joint function, mandibular movement and chewing function.

character list

• 1 12 is a structural diagram of a muscle preservation type total temporomandibular joint prosthesis according to an embodiment of the present disclosure.
• 2 12 is a usage state diagram of a muscle preservation type temporomandibular total endoprosthesis according to an embodiment of the present disclosure.
• 3a 12 is a front view of an acetabular component of a muscle preservation type temporomandibular total arthroplasty according to an embodiment of the present disclosure.
• 3b 12 is a rear (reversed) view of an acetabular component of a muscle preservation-type total temporomandibular arthroplasty according to an embodiment of the present disclosure.
• 4a 12 is a side view of a condyle member of a muscle preservation-type total temporomandibular arthroplasty according to an embodiment of the present disclosure.
• 4b 12 is a front view of a condyle member of a muscle preservation type temporomandibular total endoprosthesis according to an embodiment of the present disclosure.
• 4c 12 is a rear view of a condyle member of a muscle preservation-type total temporomandibular arthroplasty according to an embodiment of the present disclosure.
• 5a 12 is a side view showing a state of use of a condyle member of a muscle preservation type temporomandibular total endoprosthesis according to an embodiment of the present disclosure.
• 5b 12 is a side view showing a state of use of a condyle member of a muscle preservation type temporomandibular total endoprosthesis according to an embodiment of the present disclosure.

Reference List

1

socket element

11

socket section

111

bone surface

112

motion function surface

12

zygomatic support section

2

rod end element

21

Lower jaw trailing edge attachment plate

22

Sigmoid notch mounting plate

23

rod end section

231

bending section

3

mounting nail hole

A

Insertion area of the lateral pterygoid muscle

B

Masseter attachment area The downward extending part of the

C

acetabular section bending part of lower jaw trailing edge

D

mounting plate

DETAILED DESCRIPTION

Implementations of the present disclosure are illustrated below by a specific embodiment, and other advantages and effects of the present disclosure will be apparent to those skilled in the art from the disclosure of the specification.

It is open 1 until 5b referenced. It should be understood that the structure, proportion, size and the like shown in the drawings of the specification are used only for clarifying the content disclosed in the specification and for understanding and reading by those skilled in the art and are not intended to limit the implementation of the present disclosure and are therefore not technically essential. Any structural modification, scaling relationship change, or size adjustment made without affecting the effects and objectives that can be achieved by the present disclosure shall fall within the scope disclosed by the present disclosure technical content can be included. Furthermore, as used herein, the terms "top", "bottom", "left", "right", "between" and "an" are for convenience of description only and are intended to define the scope of the present do not limit the disclosure, and changing or adjusting the relative relationships is considered to be part of the scope of the present disclosure without substantially changing the technical contents.

The individualized fit described in the present application refers to fitting a shape of a side of a prosthesis used for attachment to a bone surface to a shape of an endogenous bone of different patients to achieve a good fitting effect.

As in 1 1, a muscle preservation type total temporomandibular prosthesis provided by an embodiment of the present disclosure comprises, from top to bottom, at least: an acetabulum member 1 and a condyle member 2 abutting on the acetabulum member 1; as in 3a As shown, the acetabulum member 1 comprises a zygomatic arch support portion 12 for attachment to a zygomatic arch of a human body and an acetabular cup portion 11 connected to the zygomatic arch support portion 12; as in a subdivision in a box of 4b As shown, the condyle member 2 comprises a mandibular trailing edge attachment plate 21, a sigmoid notch attachment plate 22 and a condyle portion 23. The condyle portion 23 is in the form of a full or partial condyle and abuts the acetabulum member 1. As in 1 and 2 shown, a face of a human body is used as a front side, and the lower jaw trailing edge attachment plate 21 is connected to a lower end of the condyle portion 23 and extends downward and has a plate-shaped structure and includes a lower jaw trailing edge surface mounting face closely fitted to a Surface of a trailing edge of a lower jaw of the human body is adapted. The sigmoid notch mounting plate 22 protrudes from a side of the mandibular trailing edge mounting plate 21 and extends in a direction away from the mandibular trailing edge mounting plate 21 and has a plate-like structure and includes a mandibular ramus proximal sigmoid notch portion attachment surface closely fitting a proximal sigmoid notch portion of a Lower jaw branch of the human body is adapted.

The condyle member restores a surface of a condyle of the human body, and the socket member restores a socket of the human body.

Further, a length of the lower jaw trailing edge attachment plate 21 extending downward from a lower end of the condyle portion is 25-35 mm; and/or an extension length of the sigmoid notch attachment plate 22 protruding from the mandibular trailing edge attachment plate 21 is 15-25 mm. An insertion area of the lateral pterygoid muscle and an insertion area of the masseter (i.e. areas A and B in 2 ) are not covered, and the functions of the lateral pterygoid and masseter muscles are preserved.

In an example, in a connecting portion of the lower jaw trailing edge attachment plate 21 and the sigmoid notch attachment plate 22, a width of the lower jaw trailing edge attachment plate 21 is 5-15 mm and/or a width of the sigmoid notch attachment plate 22 is 5-15 mm. The area of insertion of the lateral pterygoid muscle and the area of insertion of the masseter (i.e. areas A and B in 2 ) are not covered, and the functions of the lateral pterygoid and masseter muscles are preserved.

The width of the mandibular rear edge fixing plate 21 refers to an extending distance in a direction perpendicular to a downward extending direction of the mandibular rear edge fixing plate 21 from a lower end of the condyle portion.

The width of the sigmoid notch attachment plate 22 refers to an extending distance in a direction perpendicular to an extending direction of the sigmoid notch attachment plate 22 protruding from the lower jaw trailing edge attachment plate 21 .

In one example, a width of an end portion of the mandibular trailing edge attachment plate 21 is 5-10 mm and/or a width of an end portion of the sigmoid notch attachment plate 22 is 5-10 mm. The area of insertion of the lateral pterygoid muscle and the area of insertion of the masseter (i.e. areas A and B in 2 ) are not covered, and the functions of the lateral pterygoid and masseter muscles are preserved.

In one example, the thicknesses of the mandibular trailing edge attachment plate 21 and the sigmoid notch attachment plate 22 are each 2-3 mm.

In an example, an included angle between an extension direction of the mandibular trailing edge attachment plate 21 and an extension direction of the sigmoid notch attachment plate 22 is 60-90°. The area of insertion of the lateral pterygoid muscle and the area of insertion of the masseter (i.e. areas A and B in 2 ) are not covered, and the functions of the lateral pterygoid and masseter muscles are preserved.

Optionally, an upper end of the condyle portion 23 is a concavo-convex bend portion, a proximal bone surface of the condyle portion is a concave surface, a distal bone surface of the condyle portion is a convex surface, and the distal bone surface is in a concave-convex fit with the acetabulum portion 11 .

Optionally, a width of the joint head section 23 is 5-10 mm and/or a depth of the joint head section 23 is 10-20 mm. The condyle portion has a size similar to that of a condyle of the human body.

The depth of the condyle portion refers to an extending distance from an end of the condyle portion in contact with the acetabular member down to a contact end of the mandibular trailing edge attachment plate.

The width of the condyle portion refers to an extending distance in a direction perpendicular to a direction of depth of the condyle portion.

Furthermore, as in 4a 1, a side surface of the condyle member 2 closely fitting a bone of the human body is used as an inner surface, an upper end of the condyle portion 23 is bent toward the inner surface to form a bending portion 231, and an outer surface of the bending portion 231 is a curved surface, so that an inside of a joint and a neck of the human body is taken into account and thus an attachment of a lateral pterygoid muscle is preserved. The flexure portion is in a concavo-convex fit with the acetabular portion.

Optional is as in position D in 4a 1, an extending end portion of the lower jaw rear edge fixing plate 21 is bent toward a rear bone surface of the rear edge of the lower jaw of the human body so that a part of the rear edge of the lower jaw is encased, thereby positioning the prosthesis.

As in a 4c In the example shown, an inner surface of the condyle element can be a rough surface or have a porous structure with multiple holes, which promotes the formation of a strong bone connection with a body's own bone. The porous structure has a thickness of 0.5-1 mm.

As in 3a and 3b 1, the acetabulum portion 11 further includes a bone surface 111 and a movement function surface 112, and the bone surface 111 can be individually closely fitted to the acetabulum of the human body and an articular tubercle; and the movement function surface 112 abuts the condyle element 2 .

Furthermore, the movement function surface 112 is a concave surface.

Optionally, the movement function surface 112 has a circular arc angle of 10-30°. At this circular arc angle, the socket portion has a good matching effect with the condyle member.

Optional, as in position C in 3a shown, a length of a side of the acetabulum portion 11 remote from the sigmoid notch attachment plate 22 is greater than a length of a side near the sigmoid notch attachment plate 22. This design of the acetabular portion isolates a joint and an auditory canal of the human body and prevents the joint from moving moved backwards.

The zygomatic arch support portion 12 includes a zygomatic arch attachment surface that can be individually fitted closely to a zygomatic arch of the human body, and a thickness of the zygomatic arch support portion 12 is 2-3 mm.

Further, the plate surfaces of the zygomatic arch holding portion 12, the mandibular trailing edge attachment plate 21 and the sigmoid notch attachment plate 22 contain attachment nail holes 3, respectively.

Optionally, the number of fixing nail holes of the zygomatic arch holding portion 12 is 5-7, and the number of fixing nail holes in the mandibular trailing edge fixing plate 21 and the sigmoid notch fixing plate 22 is 2-3, respectively. Optionally, the nail holes in the mandibular trailing edge attachment plate are at a lower part of a connecting portion of the Mandibular trailing edge mounting plate and the sigmoid notch mounting plate 22 arranged.

The lower part of the connecting portion of the mandibular trailing edge attachment plate and the sigmoid notch attachment plate 22 and the sigmoid notch attachment plate has a temporomandibular joint stress distribution, and an occlusal force can be conducted effectively.

Optionally, a user's own bone can be scanned by CT or MRI scanning, etc., then a three-dimensional model is created and 3D printing is performed to obtain the prosthesis or components of the prosthesis.

In use, the acetabular member is first fixed to the zygomatic arch of the human body by the zygomatic support portion, and then, after the condyle member is mated with the acetabulum portion, the condyle member is fixed to the mandibular ramus of the human body.

The above embodiments are intended to explain the principles and effects of the present disclosure by way of example only, rather than limiting the present disclosure. Any person skilled in the art can make modifications or changes to the above embodiments without departing from the spirit and scope of the present disclosure. Therefore, any equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical teachings disclosed in the present disclosure fall within the scope defined by the claims attached to the present disclosure.

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• CN 205626192 U [0002]

Claims (10)

A muscle preservation type total temporomandibular arthroplasty, the prosthesis comprising, from top to bottom, at least: an acetabulum member (1) and a condyle member (2) abutting the acetabulum member (1); said acetabulum member (1) comprising a zygomatic arch support portion (12) for attachment to a zygomatic arch of a human body and an acetabular cup portion (11) connected to said zygomatic arch support portion (12); the condyle member (2) comprises a mandibular trailing edge attachment plate (21), a sigmoid notch attachment plate (22) and a condyle portion (23), the condyle portion (23) having a full or partial condyle shape and abutting the acetabulum member (1). ; the mandibular rear edge attachment plate (21) is connected to a lower end of the condyle portion (23) and extends downward and has a plate-like structure and includes a mandibular rear edge surface attachment surface closely fitted to a surface of a rear edge of a lower jaw of the human body; and the sigmoid notch attachment plate (22) protrudes from a side of the lower jaw trailing edge attachment plate (21) and extends in a direction away from the lower jaw trailing edge attachment plate (21) and has a plate-like structure and includes a lower jaw ramus proximal sigmoid notch portion attachment surface narrow is fitted to a proximal sigmoid notch portion of a mandibular ramus of the human body. Muscle preservation type total temporomandibular arthroplasty claim 1 wherein a length of the lower jaw trailing edge attachment plate (21) extending downward from the lower end of the condyle portion (23) is 25-35 mm; and/or an extension length of the sigmoid notch attachment plate (22) protruding from the mandibular trailing edge attachment plate (21) is 15-25 mm. Muscle preservation type total temporomandibular arthroplasty claim 1 , wherein in a connection area of the lower jaw trailing edge fixing plate (21) and the sigmoid notch fixing plate (22), a width of the lower jaw trailing edge fixing plate (21) is 5-15 mm and/or a width of the sigmoid notch fixing plate (22) is 5-15 mm amounts to. Muscle preservation type total temporomandibular arthroplasty claim 1 wherein a width of an extending end portion of the lower jaw trailing edge fixing plate (21) is 5-10 mm and/or a width of an extending end portion of the sigmoid notch fixing plate (22) is 5-10 mm. Muscle preservation type total temporomandibular arthroplasty claim 1 wherein a thickness of the lower jaw trailing edge attachment plate (21) and the sigmoid notch attachment plate (22) is 2-3 mm, respectively. Muscle preservation type total temporomandibular arthroplasty claim 1 , further comprising one or more of the following features: a. an apprehensive end portion of the lower jaw rear edge fixing plate (21) is bent to a rear bone surface of the rear edge of the lower jaw of the human body; b. an included angle between the extension directions of the lower jaw trailing edge attachment plate (21) and the sigmoid notch attachment plate (22) is 60-90°; c. a width of the joint head section (23) is 5-10 mm and/or a depth of the joint head section (23) is 10-20 mm; i.e. an upper end of the condyle portion (23) is a concavo-convex bending portion, a proximal bone surface of the condyle portion is a concave surface, a distal bone surface of the condyle portion is a convex surface, and the distal bone surface is in a concavo-convex fit with the acetabulum portion ( 11); and e. Plate surfaces of the zygomatic arch holding section (12), the mandibular trailing edge attachment plate (21) and the sigmoid notch attachment plate (22) each contain attachment nail holes (3). Muscle preservation type total temporomandibular arthroplasty claim 1 wherein an inner surface of the rod end member is a rough surface or has a porous structure. Muscle preservation type total temporomandibular arthroplasty claim 1 wherein the acetabular portion (11) comprises a bone surface (111) and a movement function surface (112), the bone surface (111) being individually closely fitted to an acetabulum of the human body and an articular tubercle; and the movement function surface (112) abuts the condyle element (2). Muscle preservation type total temporomandibular arthroplasty claim 8 , wherein the movement function surface (112) is a concave surface. Muscle preservation type total temporomandibular arthroplasty claim 1 wherein the zygomatic arch supporting portion (12) comprises a zygomatic arch mounting surface which is individually fitted closely to the zygomatic arch of the human body, and a thickness of the zygomatic arch supporting portion (12) is 2-3 mm.

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